Which expression would be easier to simplify if you used the associative property to change the grouping? A. 57 + [(-50)+(-50)]
B. 30 + (70-47.5)
C. 3+ ( 2/9 - 5/9)
D. (1.6 + 0.4) -60

Aresearcher believes increased perceived control influence the well-being of residents at a nursing home. to test this , she allowed one group of residents to have control over their daily lies, (where to eat etc) . the other group of 5 residents had these deceisions made by staff. the resident's feelings of well-being were measured on a 10 point scale at the end of a one month trial period. is there a difference on well-being?